Horizon Organic has a new president, Blaine E. McPeak, the former president of Kellogg Company’s portable breakfast and snacks division, and a leader in the company’s Kashi brand.

Dean Foods Company said Thursday that Blaine E. McPeak, a former Kellogg Co. executive, will join the company’s WhiteWave division as president of its Horizon Organic unit. McPeak will oversee all aspects of the Horizon Organic business and seek to expand the Rachel’s Organic brand, the company said.